Now showing items 77-96 of 244

    • Degree diameter problem on honeycomb networks 

      Holub, Přemys; Miller, Mirka; Pérez Rosés, Hebert; Ryan, Joe (Elsevier, 2014-08-23)
      The degree diameter problem involves finding the largest graph (in terms of the number of vertices) subject to constraints on the degree and the diameter of the graph. Beyond the degree constraint there is no restriction ...
    • Degree/diameter problem for mixed graphs 

      López Lorenzo, Ignacio; Pérez Rosés, Hebert (Elsevier, 2015)
      The Degree/diameter problem asks for the largest graphs given diameter and maximum degree. This problem has been extensively studied both for directed and undirected graphs, ando also for special classes of graphs. In this ...
    • Determination of Zn2+ concentration with AGNES using different strategies to reduce the deposition time 

      Companys Ferran, Encarnació; Cecilia Averós, Joan; Codina Montull, Glòria; Puy Llorens, Jaume; Galceran i Nogués, Josep (Elsevier, 2005)
      Absence of gradient and Nernstian equilibrium stripping (AGNES) senses the free ion concentration of Zn(II) in solutions containing different ligands, being unaffected by the lack of reversibility of the Zn2+/Zn0 couple ...
    • (Di)graph products, labelings and related results 

      López Masip, Susana-Clara (Elsevier, 2017)
      Gallian's survey shows that there is a big variety of labelings of graphs. By means of (di)graphs products we can establish strong relations among some of them. Moreover, due to the freedom of one of the factors, we can ...
    • Distance labelings: a generalization of Langford sequences 

      López Masip, Susana-Clara; Muntaner Batle, F. A. (University of Primorska, 2017)
      A Langford sequence of order m and defect d can be identified with a labeling of the vertices of a path of order 2m in which each label from d up to d + m − 1 appears twice and in which the vertices that have been labeled ...
    • Distorting the volcano 

      Fouquet, Mireille; Miret, Josep M. (Josep Maria); Valera Martín, Javier (Elsevier, 2018)
      Volcanoes of ℓ–isogenies of elliptic curves are a special case of graphs with a cycle called crater. In this paper, given an elliptic curve E of a volcano of ℓ–isogenies, we present a condition over an endomorphism ϕ ...
    • Divergence and Poincare-Liapunov constants for analytic differential systems 

      Grau Montaña, Maite; Llibre, Jaume (Elsevier, 2015)
      We consider a planar autonomous real analytic differential system with a monodromic singular point p. We deal with the center problem for the singular point p. Our aim is to highlight some relations between the divergence ...
    • Do you need to see it to believe it? Let's see statistics and geometry dynamically together! 

      Martins, José Alenxadre; Estrada Roca, M. Asunción; Nascimento, Maria Manuel (Eastern Mediterranean University, 2014)
      Statistical graphs, measures of central tendency and measures of spread are key concepts in the statistics curriculum, so we present here a dynamic method (software) that may be used in the classroom. In this work we begin ...
    • Dynamics of competition over water in a mixed oak-pine Mediterranean forest: spatio-temporal and physiological components 

      Castillo Díaz, Jorge del; Comas Rodríguez, Carles; Voltas Velasco, Jordi; Ferrio Díaz, Juan Pedro (Elsevier, 2016-12-15)
      Understanding inter- and intra-specific plant interactions and competition over water is challenging because of the lack of effective approaches for accessing and monitoring root distribution and activity. In this context, ...
    • Effect of cattle on Salmonella carriage, diversity and antimicrobial resistance in free-ranging wild boar (Sus scrofa) in northeastern Spain 

      Navarro González, Nora; Mentaberre García, Gregorio; Porrero, Concepción M.; Serrano Ferrón, Emmanuel; Mateos, Ana; López Martín, José María; Lavín González, Santiago; Domínguez Rodríguez, Lucas (Public Library of Science, 2012)
      Salmonella is distributed worldwide and is a pathogen of economic and public health importance. As a multi-host pathogen with a long environmental persistence, it is a suitable model for the study of wildlife-livestock ...
    • Effective construction of Poincaré-Bendixson regions 

      Gasull, Armengol; Giacomini, Héctor; Grau Montaña, Maite (Shanghai Normal University & Wilmington Scientific Publisher, 2017)
      This paper deals with the problem of location and existence of limit cycles for real planar polynomial differential systems. We provide a method to construct Poincaré-Bendixson regions by using transversal curves, that ...
    • Effects of a mixture of ligands on metal accumulation in diffusive gradients in thin films (DGT) 

      Altier Infantes, Alexandra; Jiménez-Piedrahita, Martín; Uribe Kaffure, Ramiro; Rey Castro, Carlos; Cecilia Averós, Joan; Galceran i Nogués, Josep; Puy Llorens, Jaume (CSIRO Publishing, 2018)
      Natural waters contain mixtures of ligands, which collectively affect the availability of trace metals. The individual contribution of each complex to the overall metal flux received by a sensor can be described in terms ...
    • El mètode de les línies per a la resolució aproximada d'equacions en derivades parcials 

      Dalfó, Cristina; Fiol, Miguel Angel (Societat Catalana de Matemàtiques, Institut d’Estudis Catalans, 2019)
      En aquest treball es descriu un mètode numèric semidiscret per a la resolució d'un tipus d'equacions en derivades parcials. És conegut com el mètode de les línies (MOL, per les sigles en anglès), i es basa en la discretització ...
    • Elliptic Curve Array Ballots for Homomorphic Tallying Elections 

      Martínez Rodríguez, Santi; Cerveró Abelló, M. Àngels; Mateu Meseguer, Víctor; Miret, Josep M. (Josep Maria); Sebé Feixas, Francesc (Springer Verlag, 2015)
      Remote voting systems implementing the homomorphic tal- lying paradigm have proven to be the best option for elections with a small range of candidates. In this paper, we propose a new homomor- phic tallying remote ...
    • Endorsement deduction and ranking in social networks 

      Pérez Rosés, Hebert; Sebé Feixas, Francesc; Ribó i Balust, Josep M. (Josep Maria) (Elsevier, 2016)
      Some social networks, such as LinkedIn and ResearchGate, allow user endorsements for specific skills. In this way, for each skill we get a directed graph where the nodes correspond to users’ profiles and the arcs represent ...
    • La enseñanza de estrategias de resolución de problemas matemáticos en la ESO: un ejemplo concreto 

      Pifarré Turmo, Manoli; Sanuy Burgués, Jaume (Universitat Autònoma de Barcelona. Institut de Ciències de l'EducacióUniversitat de València, 2001)
      Within this article is included a description and justification of a didactical sequence to improve the learning of problem solving strategies of Secondary Education students. The design of the didactical sequence is guided ...
    • Enumerating super edge-magic labelings for some types of path-like trees 

      López Masip, Susana-Clara; Muntaner Batle, F. A.; Rius Font, Miquel (University of Manitoba, 2015)
      The main goal of this paper is to use a variation of the Kronecker product of matrices in order to obtain lower bounds for the number of non isomorphic super edge-magic labelings of some types of pathlike trees. As a ...
    • Enumerating super edge-magic labelings for the union of nonisomorphic graphs 

      Ahmad, Ali; López Masip, Susana-Clara; Muntaner Batle, F. A.; Rius Font, Miquel (Cambridge University Press, 2011)
      A super edge-magic labeling of a graph G=(V,E) of order p and size q is a bijection f:V ∪E→{i}p+qi=1 such that: (1) f(u)+f(uv)+f(v)=k for all uv∈E; and (2) f(V )={i}pi=1. Furthermore, when G is a linear forest, the super ...
    • Environmental assessment of a pork-production system in North-East of Spain focusing on life-cycle swine nutrition 

      Lamnatou, Chrysovalantou; Ezcurra Ciaurriz, F. Xavier; Chemisana Villegas, Daniel; Pla Aragonés, Lluís Miquel (Elsevier, 2016-07-09)
      Given the importance of pig-meat production in Spain, the present work (based on cumulative energy demand, global warming potential, ReCiPe method and different functional units) presents a life cycle assessment of an ...
    • Equivalence classes of eccentric digraphs 

      López Lorenzo, Ignacio (Centre for Discrete Mathematics and Computing, 2017)
      The eccentric digraph operator takes a graph G (either directed or undirected) as a basis and transforms it into a digraph ED(G) with the same vertices as G and where there is an arc from a vertex u to a vertex v if and ...